US2686731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrafine pigments and methods of making same
Assignee: Northern Minerals Inc
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Filing: 1949-09-08
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Granted: 1954-08-17
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Expires: 1969-09-08
Abstract
No abstract record available.
Inventors
- 👤 Wainer Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:24
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/22; C01B33/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS OF THE CHARACTER DESCRIBED, COMPRISING FORMING A FINE SILICIOUS PIGMENT BY REACTING ON FINELY DIVIDED CALCIUM SILICATE WITH A HYDROCHLORIC ACID SOLUTION OF MOLECULAR PROPORTION TO DISPLACE THE CALCIUM, AND AS THE SOLUTION CLEARS DILUTING IT, IN A PERIOD NOT OVER ABOUT 5 MINUTES, AT A TEMPERATURE AROUND 90* C. WITH ABOUT TWO TO TWO AND A HALF TIMES ITS VOLUME OF WATER CONTAINING A SURFACE TENSION REDUCING AGENT AND A PLURALITY OF HYDROXIDES OF THE WHITE HYDROXIDEFORMING METALS OF THE GROUP CONSISTING OF ALUMINUM, MAGNESIUM, ZINC, CALCIUM, STRONTIUM AND BARIUM, WHILE STIRRING VIGOROUSLY, FILTERING, WASHING OUT CHLORIDE, AND DRYING.
Claim 2
Dependent Claim
102 words
A PROCESS OF THE CHARACTER DESCRIBED, COMPRISING FORMING A FINE SILICIOUS PIGMENT BY REACTING ON FINELY DIVIDED CALCIUM SILICATE WITH A HYDROCHLORIC ACID SOLUTION OF MOLECULAR PROPORTION TO DISPLACE THE CALCIUM, AND AS THE SOLUTION CLEARS DILUTING IT, IN A PERIOD NOT OVER ABOUT 5 MINUTES, AT A TEMPERATURE AROUND 90* C. WITH ABOUT TWO TO TWO AND A HALF TIMES ITS VOLUME OF WATER CONTAINING A SURFACE TENSION REDUCING AGENT AND A PLURALITY OF HYDROXIDES OF THE WHITE HYDROXIDEFORMING METALS OF THE GROUP CONSISTING OF ALUMINUM, MAGNESIUM, ZINC, CALCIUM, STRONTIUM AND BARIUM, WHILE STIRRING VIGOROUSLY, FILTERING, WASHING OUT CHLORIDE, AND DRYING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |